//
// (C) Copyright 2009 Irantha Suwandarathna (irantha@gmail.com)
// All rights reserved.
//

/* Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
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 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions _in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer _in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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using System;
using System.Collections.Generic;
using EffiProzDB.Persist;

namespace EffiProzDB
{

    /**
     * Manages SEQUENCE objects for a Database instance. <p>
     *
     * @author fredt@users
     * @version 1.7.2
     * @since 1.7.2
     */
    public class SequenceManager
    {

        public Dictionary<string,NumberSequence> sequenceMap;

        public SequenceManager()
        {
            sequenceMap = new Dictionary<string, NumberSequence>();
        }

        /**
         *  Drops a sequence with the specified name from this Database
         *
         * @param name of the sequence to drop
         * @  if a database access error occurs
         */
        public void dropSequence(string name)
        {

            bool found = sequenceMap.ContainsKey(name);

            Trace.check(found, Trace.SEQUENCE_NOT_FOUND, name);
            sequenceMap.Remove(name);
        }

        public NumberSequence getSequence(string name)
        {
            return (NumberSequence)sequenceMap[name];
        }

       public NumberSequence createSequence(HsqlNameManager.HsqlName hsqlname, long start,
                                      long increment,
                                      int type)
        {

            Trace.check(!sequenceMap.ContainsKey(hsqlname.name),
                        Trace.SEQUENCE_ALREADY_EXISTS);

            NumberSequence sequence = new NumberSequence(hsqlname, start,
                increment, type);

            sequenceMap.Add(hsqlname.name, sequence);

            return sequence;
        }

       public string logSequences(Session c, Logger logger)
        {

            foreach (var seq in sequenceMap.Values)
            {               

                if (seq.wasUsed())
                {
                    logger.writeSequenceStatement(c, seq);
                    seq.resetWasUsed();
                }
            }

            return null;
        }
    }
}